1.nounA place or institution of confinement, especially of long-term confinement for those convicted of serious crimes or otherwise considered undesirable by the government.
"The cold stone walls of the prison had stood for over a century."
2.nounConfinement in prison.
"Prison was a harrowing experience for him."
3.nounAny restrictive environment, such as a harsh academy or home.
"The academy was a prison for many of its students because of its strict teachers."